A case study of multi-temperature coronal jets for emerging flux MHD models is presented in chapter . The jets from AR NOAA 12644 at the western solar limb were observed in all the hot filters of Atmospheric Imaging Assembly [1]} and in the transition region temperatures by Interface Region Imaging Spectrograph [2]}.
In the pre-phase of the jets, quasi-periodic intensity oscillations are observed, which are in phase with the small ejections; they have a period between 2 to 6 minutes, and are reminiscent of acoustic or MHD waves.
The jets are initiated at the top of a canopy-like double-chambered structure with cool emission on one
and hot emission on the other side.
The hot jets are collimated in the hot temperature filters, have high velocities (around 250 km s\(^{-1}\) ) and accompanied by the cool surges and ejected kernels. The cool surge with kernels show a direct alignment with the cool ejection and plasmoids which have described in theoretical models.
This series of hot jets and cool surges provides a good evidence for the 2D and 3D MHD models ([3]}; [4]}) that result from magnetic flux emergence.
